ABAP Select data from SAP table PS0644 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PS0644 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to PS0644. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the PS0644 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_PS0644 TYPE STANDARD TABLE OF PS0644,
      WA_PS0644 TYPE PS0644,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <PS0644> TYPE PS0644.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PS0644.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PS0644
  INTO TABLE IT_PS0644.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PS0644
*  INTO TABLE @DATA(IT_PS06442).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_PS0644 INDEX 1 INTO DATA(WA_PS06442).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PS0644 ASSIGNING <PS0644>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PS0644>-VHELD = 1.
<PS0644>-VHELK = 1.
<PS0644>-HATHT = 1.
<PS0644>-HATHI = 1.
<PS0644>-HATHK = 1.

ENDLOOP.

LOOP AT IT_PS0644 INTO WA_PS0644.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PS0644-HKSZN, sy-vline,
  WA_PS0644-HKSZK, sy-vline,
  WA_PS0644-VKATD, sy-vline,
  WA_PS0644-VKATK, sy-vline,
  WA_PS0644-VKSZN, sy-vline,
  WA_PS0644-VKSZK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PS0644 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_PS0644 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_PS0644 INTO WA_PS0644.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PS0644_STR, 
VHELD TYPE STRING,
VHELK TYPE STRING,
HATHT TYPE STRING,
HATHI TYPE STRING,
HATHK TYPE STRING,
HKSZN TYPE STRING,
HKSZK TYPE STRING,
VKATD TYPE STRING,
VKATK TYPE STRING,
VKSZN TYPE STRING,
VKSZK TYPE STRING,
MSATD TYPE STRING,
MSATK TYPE STRING,
MSKIN TYPE STRING,
MSKIK TYPE STRING,
KJVMD TYPE STRING,
KJVMK TYPE STRING,
KJVEV TYPE STRING,
KJVHO TYPE STRING,
KJVNA TYPE STRING,
VEGKD TYPE STRING,
RDAHD TYPE STRING,
FELMK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PS0644_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_PS0644_STR-VHELD sy-vline 
WA_PS0644_STR-VHELK sy-vline 
WA_PS0644_STR-HATHT sy-vline 
WA_PS0644_STR-HATHI sy-vline 
WA_PS0644_STR-HATHK sy-vline 
WA_PS0644_STR-HKSZN sy-vline 
WA_PS0644_STR-HKSZK sy-vline 
WA_PS0644_STR-VKATD sy-vline 
WA_PS0644_STR-VKATK sy-vline 
WA_PS0644_STR-VKSZN sy-vline 
WA_PS0644_STR-VKSZK sy-vline 
WA_PS0644_STR-MSATD sy-vline 
WA_PS0644_STR-MSATK sy-vline 
WA_PS0644_STR-MSKIN sy-vline 
WA_PS0644_STR-MSKIK sy-vline 
WA_PS0644_STR-KJVMD sy-vline 
WA_PS0644_STR-KJVMK sy-vline 
WA_PS0644_STR-KJVEV sy-vline 
WA_PS0644_STR-KJVHO sy-vline 
WA_PS0644_STR-KJVNA sy-vline 
WA_PS0644_STR-VEGKD sy-vline 
WA_PS0644_STR-RDAHD sy-vline 
WA_PS0644_STR-FELMK sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.